This tutorial is about chrooting a BIND (named) installation on Debian 6. Chrooting is used for security reasons, in case that BIND gets hacked on the server, the hacker is jailed into the chroot and can not get access to
Send all outgoing email trough one IP address in postfix
When a server has more than one IP address, then postfix will use all IP addresses randomly to send out emails. This can cause your emails to be listed as SPAM on other servers because the sending IP does not